Malicious PDF — malware analysis report

Static analysis result for SHA-256 f760a625fd444bcb…

MALICIOUS

PDF

66.2 KB Created: 2020-11-26 08:56:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 064fb77362c7eb8ea7250e0a9191415e SHA-1: 13d7ecb272caf99491def31a88327856ff6a7572 SHA-256: f760a625fd444bcb9c2d8ffae0154372b823d4d282db636ddc6edf44f53385ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which are disguised as legitimate document titles, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffi.ru/strik?utm_term=fundamentals+of+physics+10th+edition+pdf+online
    • https://xatomurukazaj.weebly.com/uploads/1/3/4/3/134378662/katoduxuvasax.pdf
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/4727417.pdf
    • https://cdn-cms.f-static.net/uploads/4446915/normal_5f9f9c8876265.pdf
    • https://cdn-cms.f-static.net/uploads/4394062/normal_5fbdbd083468e.pdf
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5fb30ce5f19af.pdf
    • https://cdn-cms.f-static.net/uploads/4382421/normal_5fb5f8a9b7b77.pdf
    • https://cdn-cms.f-static.net/uploads/4375197/normal_5fa420b6a871d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vatosolikijike/fuvasolizixixa.pdf
    • https://s3.amazonaws.com/belapawerezuju/arcangel_miguel_oracion_proteccion.pdf
    • https://s3.amazonaws.com/risisipajole/alberta_program_of_studies_social_studies_grade_2.pdf
    • https://s3.amazonaws.com/gedesisumi/vuzeroxefeladoneku.pdf
    • https://uploads.strikinglycdn.com/files/f4d1d573-4489-47f4-97eb-5b1f01e48e1a/berusewewevinoditero.pdf
    • https://uploads.strikinglycdn.com/files/f1115f01-8bbc-4fc9-8f8a-dd42f085ed2a/supidemofabuk.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8b1.bin
cfab3d31323c85a8432e999f0562d2eb91bf0f00dbb0eabffe67c7ef5010b18d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B1 5552 bytes
font_01_sfnt_off0000db82.bin
cfdad4866c57efdb0221406591c7a3fca1287d2eb2478ce39328b50fde1fda72
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 9544 bytes